The Collaborative International Dictionary
Interscribing
Interscribe \In`ter*scribe"\, v. t. [imp. & p. p. Interscribed; p. pr. & vb. n. Interscribing.] [L. interscribere; inter between + scribere to write.] To write between. [R.]
Wiktionary
interscribing
vb. (present participle of interscribe English)